FEST VAINQUEUR, a visual kei rock band from Japan, was formed by former members of SINCREA. The band, which has seen various members come and go, was named under the concept of "festival" (Fest in German) and "winner" (Vainqueur in French). After SINCREA disbanded in 2010, FEST VAINQUEUR debuted later that year and quickly made its mark on the visual kei scene with energetic performances and a strong fanbase. Their journey has included notable highs and challenging lows, such as member changes and a temporary disbandment. In 2017, they faced the departure of KAZI due to health issues, adjusting their lineup and continuing with support members. The band announced a hiatus in 2018 to allow members to pursue individual projects but promised a return, which they fulfilled by rebranding as "FV" due to legal issues with their former name. In 2019, the band overcame these challenges and reclaimed their name, FEST VAINQUEUR. The members are HAL (Vo), GAKU (Gt), I'LL (Gt) , and HIRO (Ba). Celebrating their tenth anniversary in 2020, they announced a significant performance at Osaka Castle Hall, marking a pinnacle of their decade-long career. Their release, "GLORIA - Eiko no Kizuna" (2015) symbolizes their enduring bond and triumph over adversity, showcasing their development and resilience as artists.